关键词: 橘皮缺陷；钢板粗糙度；涂料材料；涂装工艺

Abstract: In the trial production of the new car, the topcoat quality of the front and rear exterior panels are poor, mainly showing orange peel defects. In order to solve the orange peel defects before the mass production of the car, through the investigation of the key parameters of the topcoat and the process parameters of other proceduces, it is determined that the main influencing factors of orange peel defects are the surface appearance of the steel plate, painting materials and coating processes. After the optimization and the verification, the coating defects of orange peel on front and rear door panels are improved after the roughness of the steel plate is reduced from 1.264 μm to 0.8～1.0 μm, the varnish is changed from 1 K to 2 K, the varnish spraying flow is increased by 10%～15% and the chain speed is reduced by 6.4%.

Key words: Orange peel defects; Steel plate roughness; Painting materials; Coating processes